Lock N' Load with R. Lee Ermey on HISTORY: Helicopters Promo August 21stAirs Fridays at 9pm/8c on HISTORY. Get hands-on with some of the world's fiercest firearms. Actor, sergeant, drill instructor, Vietnam veteran, and Mail Call host R. Lee Ermey takes viewers on a fascinating ride through the pathology of each featured weapon: where it came from, who thought of it, who improved it, its victories, its defeats, its impact on history and where it is now.